“The growth in the category has been explosive for us,” said Blake Leonard, a member of the third generation to run the family-owned business, and president of Stew Leonard’s Wine & Spirits. The retailer has even removed pallets of beer to make way for the buzzy beverages. Three years ago, Stew Leonard’s carried fewer than 10 of these brands. Today, it offers up to 75, Ms. Leonard said, estimating that sales are 25 percent higher this January than last year.